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Re: [libvirt] [PATCH] RFC: qemu: add spice/virgl rendernode



On Mon, Feb 13, 2017 at 07:19:04AM -0500, Marc-André Lureau wrote:
> Hi
> 
> ----- Original Message -----
> > On Mon, Feb 13, 2017 at 03:51:48PM +0400, marcandre lureau redhat com wrote:
> > > From: Marc-André Lureau <marcandre lureau redhat com>
> > > 
> > > I am working on a WIP series to add QEMU Spice/virgl rendernode option.
> > > Since rendernodes are not stable across reboots, I propose that QEMU
> > > accepts also a PCI address (other bus types may be added in the future).
> > 
> > Hmm, can you elaborate on this aspect ?  It feels like a parallel
> > to saying NIC device names are not stable, so we should configure
> > guests using PCI addresses instead of 'eth0', etc but we stuck with
> > using NIC names in libvirt on the basis that you can create udev
> > rules to ensure stable naming ?
> > 
> > So is there not a case to be made that if you want stable render
> > device names when multiple NICs are present, then you should use
> > udev to ensure a given device always maps to the same PCI dev.
> 
> I thought it was simpler to use a PCI address (do you expect users
> to create udev rules for the GPUs?)

Well most users will only have 1 GPU so surely this won't be a problem
in the common case.  Is it possible to get some stable naming rules into
udev upstream though, so all distros get stable names by default


Regards,
Daniel
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